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No. 6ll,|62. Patented Sept. 20, I898. F. S. WORSLEY.

ELECTRIC ARC LAMP.

(Application filed Mar. 16, 1898.) .0 Model 2 Shouts-Sheet jig]\N\TNESSES- \NVENTOR fww/w' FREDERIC SWoRsLa MMM HIS HT 'ORNEY5 No.6ll,|62. Patented Sept. 20, I898. F. S. WORSLEY.

v ELECTRIC ARC LAMP.

Application filed In. 15, 1898) (No Model.) 2 Sheeis-She'et 2.

WlTNEa'bES )NVENTOR i FREDERIOSWORSLEY h) jfi M HIG HTTORNEYS.

UNITED STATES PATENT OFFICE.

FREDERIO S. IVORSLEY, OF LONDON, ENGLAND, ASSIGNOR TO THE BRITISHBLAI'INIK ARC LIGHT COMPANY, LIMITED, OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 611,162, datedSeptember 20, 1898.

Application filed March 1 5, 1898.

To all whom, it may concern.-

Be it known that I, FREDERIO STANHOPE IVoR-sLEY, electrical engineer, asubject of the Queen of Great Britain and Ireland, and

5 a resident of 119 Church Lane, Charlton, London, in the county ofKent, England, have invented new and useful Improvements in or Connectedwith Electric-Arc Lamps, (for which I have applied for a patent in GreatBritain, No. 19,307, dated August 20, 1897,)

of which the following is a specification.

My invention relates to electric-arc lamps in which the feeding of thecarbons is eifected by a diiferential system of coils, and particu- Ilarly to lamps which are used upon a circuit in series with otherarc-lamps or other translating devices; and my said invention has forits object to provide a simple and efficient device for short-circuitingthe lamp if from any cause the proper feeding of the carbons beinterrupted to a dangerous extent. For this purpose I utilize the maincoil of the lamp to maintain the said short-circuiting of the lamp bycausing the core of the said main coil to effect the short-circuiting ofthe current across the carbons, so that the lamp is cutout. Thefollowing are convenient arrangements according to my invention, which Iwill describe with reference to the accompanying drawings, which show somuch of two different forms of the lamp as is necessary to explain myinvention.

I will presume in this description for the sake of brevity that the maincoil is at the 3 5 positive terminal of the lamp; but it will be readilyunderstood that the arrangement can also be applied to cases where themain coil is at the negative terminal.

In the arrangement shown in Figure 1 I provide on the frame A of thelamp and insulated from it and beneath the core I) of the main coil B apiece or block G of iron or other magnetizable material (hereinafterreferred to as the block 0) which is electrically connected to a part ofthe circuit after the current leaves the main coil and before it reachesthe carbon. The block 0 is shown as being secured to but insulated fromthe frame of the lamp. The main coil B is elec- 5o trically connected tothe carbons by its end Serial No. 673,955. (No model.)

being pinched between the binding-screws e on a conducting-piece E, towhich the lead to one of the carbons is connected. To prevent the coreI) from coming into contact with the block O when the lamp is not inoperation, I provide a spring g or its equivalent, which at one endbears upon the frame A and at the other end upon a projection on thecore I). lVhen the conditions are such that the shuntcoil D has acted toa predetermined limit at which the lamp is to be cut out, the core I) ofthe main coil has been thereby caused to overcome the influence of thespring g and come into contact with the aforesaid block 0 and ismagnetically held thereby,and as this block is electrically connected toa part of the circuit after the current has gone through the main coil Band before it reaches the carbons, and as the said core is then throughthe frame or mechanism of the lamp or otherwise in any suitable way inelectric connection with the circuit beyond the carbons, the lamp isshortcircuited, the current then passing through the coil B, block 0,core I), and thence through the lamp-frame A.

In the second arrangement, as shown in Fig. 2, the short-circuiting ofthe lamp is effected by providing the cores 1) with a conductingconnection F and spring contact-piece f, which makes contact with thetop bindingscrew 6 at or immediately before the time the core 2')reaches the block 0, which in this case is not necessarily insulatedfrom the frame A and is not connected electrically with the circuitexcept after the current has passed through the carbons, theshort-oircuiting of the lamp being effected by the current being causedto pass through the said contact-pieces c and f, connection F, and coreI), and out by the frame of the lamp. When the lamp is not in operation,the core I) of the main coil B is held out of contact with the block Oby the spring g, which acts against the under side of the connection F.

I claim as my invention- 1. An electric-arc lamp provided withshortcircuiting devices comprising in combination with the main coil ofthe lamp and its core, a piece or block of magnetizable material withwhich said core is adapted to come into conbination with the main coilof the lamp and 15 its core, a piece or block of magnetizable materialinsulated from said frame, said core being adapted to come into contactWith said block and short circuit the carbons when their proper feedingis interrupted, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FREDERIO S. VVORSLEY.

Witnesses:

SAMUEL CRAUSAR, WILLIAM FREDERICK UPToN.

